The synthesis of the compound 1~9 of embodiment 1
Composition principle:
1st, the synthesis of compound 1
(1) synthesis of intermediate
0.01mol cyano acethydrazide is placed in three-necked bottle, 15mL dichloromethane is added and makees solvent, 3mL acetic acid is urged
Stirred under agent, normal temperature.Take 0.01mol thiophene -2-formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure addition
Funnel is added dropwise in three-necked bottle, reacts 5h, and terminal is detected with thin layer silica gel plate (TLC).Place reaction liquid into beaker, with steaming
Distilled water is washed till neutrality repeatedly.Divide after liquid and vacuum distillation, suction filtration and dry, obtain intermediate.
(2) synthesis of target compound
Take intermediate 0.01mol to be placed in three-necked bottle, add 15mL absolute ethyl alcohols and make solvent, 3mL triethylamines make catalyst,
Stirred under conditions of 50 DEG C.Take 0.01mol furfural to be added in 5mL dichloromethane, fully after dissolving, use constant pressure funnel
It is added dropwise in three-necked bottle, reacts 1h, terminal is detected with thin layer silica gel plate (TLC).After reaction completely, reaction solution is poured into
In 500mL beakers, 300mL petroleum ether and stirring is added, there is solid matter precipitation.After its suction filtration and drying, acetonitrile is used:Nothing
Water-ethanol=1:10 mixed solution is recrystallized to crude product, obtains target product.
Yellow powder;IR(KBr)νmax(cm-1):3423,2207,1685,1612,1557,937;1H NMR(300MHz,
DMSO-d6)δ(ppm):11.77(1H,s),8.66(1H,s),8.16(1H,s),8.07(1H,s),7.68(1H,s),7.48
(1H, s), 7.45 (1H, d, J=2.4Hz), 7.14 (1H, s), 6.84 (1H, d, J=1.5Hz);13C NMR(75MHz,DMSO-
d6)δ(ppm):158.28(1C),149.40(1C),148.79(1C),144.69(1C),139.00(1C),136.98(1C),
131.98(1C),129.84(1C),128.28(1C),122.70(1C),116.15(1C),114.37(1C),100.00(1C);
HRMS(ESI)m/z:Calcd for C13H10N3O2S[M+H]+:272.0488,Found:272.0488.
2nd, the synthesis of compound 2
(1) synthesis of intermediate
0.01mol cyano acethydrazide is placed in three-necked bottle, 15mL dichloromethane is added and makees solvent, 3mL acetic acid is urged
Stirred under agent, normal temperature.Take 0.01mol thiophene -2-formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure addition
Funnel is added dropwise in three-necked bottle, reacts 5h, and terminal is detected with thin layer silica gel plate (TLC).Place reaction liquid into beaker, with steaming
Distilled water is washed till neutrality repeatedly.Divide after liquid and vacuum distillation, suction filtration and dry, obtain intermediate.
(2) synthesis of target compound
Take intermediate 0.01mol to be placed in three-necked bottle, add 15mL absolute ethyl alcohols and make solvent, 3mL triethylamines make catalyst,
Stirred under conditions of 50 DEG C.Take 0.01mol 5 methyl furfural to be added in 5mL dichloromethane, fully after dissolving, dripped with constant pressure
Liquid funnel is added dropwise in three-necked bottle, reacts 1h, and terminal is detected with thin layer silica gel plate (TLC).After reaction completely, reaction solution is fallen
Enter in 500mL beakers, add 300mL petroleum ether and stirring, there is solid matter precipitation.After its suction filtration and drying, acetonitrile is used:
Absolute ethyl alcohol=1:10 mixed solution is recrystallized to crude product, obtains target product.
Yellow powder;IR(KBr)νmax(cm-1):3441,2208,1672,1604,1543,941;1H NMR(400MHz,
DMSO-d6)δ(ppm):11.67 (1H, s), 8.66 (1H, s), 7.97 (1H, s), 7.70 (1H, d, J=4.4Hz), 7.48 (1H,
D, J=3.2Hz), 7.39 (1H, d, J=3.2Hz), 7.15 (1H, t, J=4.0Hz), 6.53 (1H, d, J=3.6Hz), 2.44
(3H,s);13C NMR(100MHz,DMSO-d6)δ(ppm):159.89(1C),158.66(1C),147.75(1C),144.56
(1C),139.19(1C),136.70(1C),131.97(1C),129.86(1C),128.37(1C),124.86(1C),116.49
(1C),111.60(1C),97.81(1C),14.35(1C);HRMS(ESI)m/z:Calcd for C14H12N3O2S[M+H]+:
286.0645,Found:286.0641.
3rd, the synthesis of compound 3
(1) synthesis of intermediate
0.01mol cyano acethydrazide is placed in three-necked bottle, 15mL dichloromethane is added and makees solvent, 3mL acetic acid is urged
Stirred under agent, normal temperature.Take 0.01mol thiophene -2-formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure addition
Funnel is added dropwise in three-necked bottle, reacts 5h, and terminal is detected with thin layer silica gel plate (TLC).Place reaction liquid into beaker, with steaming
Distilled water is washed till neutrality repeatedly.Divide after liquid and vacuum distillation, suction filtration and dry, obtain intermediate.
(2) synthesis of target compound
Take intermediate 0.01mol to be placed in three-necked bottle, add 15mL absolute ethyl alcohols and make solvent, 3mL triethylamines make catalyst,
Stirred under conditions of 50 DEG C.Take 0.01mol thiophene -2-formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure
Dropping funel is added dropwise in three-necked bottle, reacts 1h, and terminal is detected with thin layer silica gel plate (TLC).After reaction completely, by reaction solution
Pour into 500mL beakers, add 300mL petroleum ether and stirring, there is solid matter precipitation.After its suction filtration and drying, second is used
Nitrile:Absolute ethyl alcohol=1:10 mixed solution is recrystallized to crude product, obtains target product.
Yellow powder;IR(KBr)νmax(cm-1):3433,2207,1682,1581,1551,931;1H NMR(300MHz,
DMSO-d6)δ(ppm):11.79 (1H, s), 8.66 (1H, s), 8.51 (1H, s), 8.13 (1H, d, J=4.2Hz), 7.96 (1H,
s),7.68(1H,s),7.49(1H,s),7.33(1H,s),7.14(1H,s);13C NMR(75MHz,DMSO-d6)δ(ppm):
158.29(1C),144.92(1C),144.65(1C),138.98(1C),138.84(1C),136.25(1C),135.93(1C),
131.98(1C),129.85(1C),129.02(1C),128.28(1C),116.60(1C),100.79(1C);HRMS(ESI)m/
z:Calcd for C13H10N3OS2[M+H]+:288.0260,Found:288.0255.
4th, the synthesis of compound 4
(1) synthesis of intermediate
0.01mol cyano acethydrazide is placed in three-necked bottle, 15mL dichloromethane is added and makees solvent, 3mL acetic acid is urged
Stirred under agent, normal temperature.Take 0.01mol thiophene -2-formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure addition
Funnel is added dropwise in three-necked bottle, reacts 5h, and terminal is detected with thin layer silica gel plate (TLC).Place reaction liquid into beaker, with steaming
Distilled water is washed till neutrality repeatedly.Divide after liquid and vacuum distillation, suction filtration and dry, obtain intermediate.
(2) synthesis of target compound
Take intermediate 0.01mol to be placed in three-necked bottle, add 15mL absolute ethyl alcohols and make solvent, 3mL triethylamines make catalyst,
Stirred under conditions of 50 DEG C.0.01mol 2- furylacroleins are taken to be added in 5mL dichloromethane, fully after dissolving, with perseverance
Pressure dropping funel is added dropwise in three-necked bottle, reacts 1h, and terminal is detected with thin layer silica gel plate (TLC).After reaction completely, it will react
Liquid is poured into 500mL beakers, adds 300mL petroleum ether and stirring, there is solid matter precipitation.After its suction filtration and drying, use
Acetonitrile:Absolute ethyl alcohol=1:10 mixed solution is recrystallized to crude product, obtains target product.
Yellow powder;IR(KBr)νmax(cm-1):3425,2210,1678,1596,1551,926;1H NMR(400MHz,
DMSO-d6)δ(ppm):11.78 (1H, s), 8.65 (1H, s), 8.09 (1H, d, J=12.0Hz), 7.97 (1H, s), 7.71
(1H, d, J=4.4Hz), 7.50 (1H, s), 7.44 (1H, d, J=14.8Hz), 7.16 (1H, s), 7.04-6.94 (2H, m),
6.72(1H,dd,J1=1.6Hz, J2=1.6Hz);13C NMR(100MHz,DMSO-d6)δ(ppm):158.13(1C),152.46
(1C),151.59(1C),147.36(1C),144.58(1C),139.15(1C),133.84(1C),132.07(1C),129.93
(1C),128.38(1C),120.79(1C),117.54(1C),115.64(1C),113.89(1C),105.55(1C);HRMS
(ESI)m/z:Calcd for C15H12N3O2S[M+H]+:298.0645,Found:298.0640.
5th, the synthesis of compound 5
(1) synthesis of intermediate
0.01mol cyano acethydrazide is placed in three-necked bottle, 15mL dichloromethane is added and makees solvent, 3mL acetic acid is urged
Stirred under agent, normal temperature.Take 0.01mol 5- bromothiophene -2- formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure
Dropping funel is added dropwise in three-necked bottle, reacts 5h, and terminal is detected with thin layer silica gel plate (TLC).Place reaction liquid into beaker,
Neutrality is washed till repeatedly with distilled water.Divide after liquid and vacuum distillation, suction filtration and dry, obtain intermediate.
(2) synthesis of target compound
Take intermediate 0.01mol to be placed in three-necked bottle, add 15mL absolute ethyl alcohols and make solvent, 3mL triethylamines make catalyst,
Stirred under conditions of 50 DEG C.Take 0.01mol furfural to be added in 5mL dichloromethane, fully after dissolving, use constant pressure funnel
It is added dropwise in three-necked bottle, reacts 1h, terminal is detected with thin layer silica gel plate (TLC).After reaction completely, reaction solution is poured into
In 500mL beakers, 300mL petroleum ether and stirring is added, there is solid matter precipitation.After its suction filtration and drying, acetonitrile is used:Nothing
Water-ethanol=1:10 mixed solution is recrystallized to crude product, obtains target product.
Yellow powder;IR(KBr)νmax(cm-1):3432,2215,1687,1616,1554,931;1H NMR(400MHz,
DMSO-d6)δ(ppm):11.86(1H,s),8.58(1H,s),8.19(1H,s),8.08(1H,s),7.47(1H,s),7.36
(1H, s), 7.30 (1H, d, J=2.8Hz), 6.87 (1H, dd, J1=1.6Hz, J2=1.6Hz);13C NMR(100MHz,
DMSO-d6)δ(ppm):158.44(1C),149.58(1C),148.90(1C),143.95(1C),141.03(1C),137.19
(1C),132.58(1C),131.83(1C),122.86(1C),116.19(1C),115.80(1C),114.50(1C),100.06
(1C);HRMS(ESI)m/z:Calcd for C13H9BrN3O2S[M+H]+:349.9593,Found:349.9592.
6th, the synthesis of compound 6
(1) synthesis of intermediate
0.01mol cyano acethydrazide is placed in three-necked bottle, 15mL dichloromethane is added and makees solvent, 3mL acetic acid is urged
Stirred under agent, normal temperature.Take 0.01mol 5- bromothiophene -2- formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure
Dropping funel is added dropwise in three-necked bottle, reacts 5h, and terminal is detected with thin layer silica gel plate (TLC).Place reaction liquid into beaker,
Neutrality is washed till repeatedly with distilled water.Divide after liquid and vacuum distillation, suction filtration and dry, obtain intermediate.
(2) synthesis of target compound
Take intermediate 0.01mol to be placed in three-necked bottle, add 15mL absolute ethyl alcohols and make solvent, 3mL triethylamines make catalyst,
Stirred under conditions of 50 DEG C.Take 0.01mol 5 methyl furfural to be added in 5mL dichloromethane, fully after dissolving, dripped with constant pressure
Liquid funnel is added dropwise in three-necked bottle, reacts 1h, and terminal is detected with thin layer silica gel plate (TLC).After reaction completely, reaction solution is fallen
Enter in 500mL beakers, add 300mL petroleum ether and stirring, there is solid matter precipitation.After its suction filtration and drying, acetonitrile is used:
Absolute ethyl alcohol=1:10 mixed solution is recrystallized to crude product, obtains target product.
Orange crystal;IR(KBr)νmax(cm-1):3445,2206,1672,1603,1541,971;1H NMR(400MHz,
DMSO-d6)δ(ppm):11.75 (1H, s), 8.57 (1H, s), 7.97 (1H, s), 7.39 (1H, s), 7.34 (1H, d, J=
3.6Hz), 7.28 (1H, d, J=3.2Hz), 6.54 (1H, d, J=3.2Hz), 2.44 (3H, s);13C NMR(100MHz,DMSO-
d6)δ(ppm):159.95(1C),158.70(1C),147.73(1C),143.65(1C),141.10(1C),136.78(1C),
132.43(1C),131.76(1C),124.94(1C),116.42(1C),115.71(1C),111.62(1C),97.67(1C),
14.36(1C);HRMS(ESI)m/z:Calcd for C14H11BrN3O2S[M+H]+:363.9750,Found:363.9750.
7th, the synthesis of compound 7
(1) synthesis of intermediate
0.01mol cyano acethydrazide is placed in three-necked bottle, 15mL dichloromethane is added and makees solvent, 3mL acetic acid is urged
Stirred under agent, normal temperature.Take 0.01mol 5- bromothiophene -2- formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure
Dropping funel is added dropwise in three-necked bottle, reacts 5h, and terminal is detected with thin layer silica gel plate (TLC).Place reaction liquid into beaker,
Neutrality is washed till repeatedly with distilled water.Divide after liquid and vacuum distillation, suction filtration and dry, obtain intermediate.
(2) synthesis of target compound
Take intermediate 0.01mol to be placed in three-necked bottle, add 15mL absolute ethyl alcohols and make solvent, 3mL triethylamines make catalyst,
Stirred under conditions of 50 DEG C.Take 0.01mol thiophene -2-formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure
Dropping funel is added dropwise in three-necked bottle, reacts 1h, and terminal is detected with thin layer silica gel plate (TLC).After reaction completely, by reaction solution
Pour into 500mL beakers, add 300mL petroleum ether and stirring, there is solid matter precipitation.After its suction filtration and drying, second is used
Nitrile:Absolute ethyl alcohol=1:10 mixed solution is recrystallized to crude product, obtains target product.
Orange powder;IR(KBr)νmax(cm-1):3433,2209,1687,1584,1557,971;1H NMR(400MHz,
DMSO-d6)δ(ppm):11.88 (1H, s), 8.57 (1H, s), 8.51 (1H, s), 8.17 (1H, d, J=4.8Hz), 7.98 (1H,
s),7.37-7.31(3H,m);13C NMR(100MHz,DMSO-d6)δ(ppm):158.48(1C),145.12(1C),143.89
(1C),141.01(1C),139.01(1C),136.34(1C),136.14(1C),132.58(1C),131.83(1C),129.15
(1C),116.66(1C),115.80(1C),100.84(1C);HRMS(ESI)m/z:Calcd for C13H9BrN3OS2[M+H
]+:365.9365,Found:365.9365.
8th, the synthesis of compound 8
(1) synthesis of intermediate
0.01mol cyano acethydrazide is placed in three-necked bottle, 15mL dichloromethane is added and makees solvent, 3mL acetic acid is urged
Stirred under agent, normal temperature.Take 0.01mol 5- bromothiophene -2- formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure
Dropping funel is added dropwise in three-necked bottle, reacts 5h, and terminal is detected with thin layer silica gel plate (TLC).Place reaction liquid into beaker,
Neutrality is washed till repeatedly with distilled water.Divide after liquid and vacuum distillation, suction filtration and dry, obtain intermediate.
(2) synthesis of target compound
Take intermediate 0.01mol to be placed in three-necked bottle, add 15mL absolute ethyl alcohols and make solvent, 3mL triethylamines make catalyst,
Stirred under conditions of 50 DEG C.Take 0.01mol 3- pyridine carboxaldehydes to be added in 5mL dichloromethane, fully after dissolving, dripped with constant pressure
Liquid funnel is added dropwise in three-necked bottle, reacts 1h, and terminal is detected with thin layer silica gel plate (TLC).After reaction completely, reaction solution is fallen
Enter in 500mL beakers, add 300mL petroleum ether and stirring, there is solid matter precipitation.After its suction filtration and drying, acetonitrile is used:
Absolute ethyl alcohol=1:10 mixed solution is recrystallized to crude product, obtains target product.
Yellow powder;IR(KBr)νmax(cm-1):3445,2230,1663,1614,1551,967;1H NMR(400MHz,
DMSO-d6)δ(ppm):12.07 (1H, s), 9.05 (1H, s), 8.77 (1H, d, J=4.4Hz), 8.59 (1H, s), 8.45 (1H,
D, J=8.0Hz), 8.34 (1H, s), 7.67 (1H, dd, J1=4.8Hz, J2=5.2Hz), 7.41 (1H, d, J=3.6Hz),
7.32 (1H, d, J=3.6Hz);13C NMR(100MHz,DMSO-d6)δ(ppm):158.09(1C),153.13(1C),151.86
(1C),149.24(1C),144.38(1C),140.81(1C),136.52(1C),132.99(1C),131.93(1C),128.51
(1C),124.68(1C),116.11(1C),116.06(1C),107.97(1C);HRMS(ESI)m/z:Calcd for
C14H10BrN4OS[M+H]+:360.9753,Found:360.9756.
9th, the synthesis of compound 9
(1) synthesis of intermediate
0.01mol cyano acethydrazide is placed in three-necked bottle, 15mL dichloromethane is added and makees solvent, 3mL acetic acid is urged
Stirred under agent, normal temperature.Take 0.01mol 5- bromothiophene -2- formaldehyde to be added in 5mL dichloromethane, fully after dissolving, use constant pressure
Dropping funel is added dropwise in three-necked bottle, reacts 5h, and terminal is detected with thin layer silica gel plate (TLC).Place reaction liquid into beaker,
Neutrality is washed till repeatedly with distilled water.Divide after liquid and vacuum distillation, suction filtration and dry, obtain intermediate.
(2) synthesis of target compound
Take intermediate 0.01mol to be placed in three-necked bottle, add 15mL absolute ethyl alcohols and make solvent, 3mL triethylamines make catalyst,
Stirred under conditions of 50 DEG C.0.01mol 2- furylacroleins are taken to be added in 5mL dichloromethane, fully after dissolving, with perseverance
Pressure dropping funel is added dropwise in three-necked bottle, reacts 1h, and terminal is detected with thin layer silica gel plate (TLC).After reaction completely, it will react
Liquid is poured into 500mL beakers, adds 300mL petroleum ether and stirring, there is solid matter precipitation.After its suction filtration and drying, use
Acetonitrile:Absolute ethyl alcohol=1:10 mixed solution is recrystallized to crude product, obtains target product.
Yellow powder;IR(KBr)νmax(cm-1):3446,2213,1688,1624,1557,929;1H NMR(400MHz,
DMSO-d6)δ(ppm):11.85 (1H, s), 8.56 (1H, s), 8.09 (1H, d, J=11.6Hz), 7.97 (1H, d, J=
1.2Hz), 7.44 (1H, d, J=14.8Hz), 7.36 (1H, s), 7.30 (1H, d, J=3.2Hz), 7.04-6.93 (2H, m),
6.72(1H,dd,J1=1.6Hz, J2=1.6Hz);13C NMR(100MHz,DMSO-d6)δ(ppm):152.59(1C),151.59
(1C),147.46(1C),143.69(1C),141.04(1C),134.01(1C),132.61(1C),131.84(1C),120.74
(1C),117.66(1C),115.81(1C),115.60(1C),113.94(1C),105.42(1C),99.99(1C);HRMS
(ESI)m/z:Calcd for C15H11BrN3O2S[M+H]+:375.9750,Found:375.9753.
The measure of the compounds of this invention insecticidal activity of test example 1
1. for examination insect
The instar larvae of mythimna separata 3, the instar larvae of corn borer 3, Tetranychus cinnabarinus is into mite, the instar larvae of Culex pipiens pallens 3, they be it is indoor often
The sensitive strain that year for many generations raises.
2. the assay method of mythimna separata
Testing sample is dissolved in dimethyl sulfoxide and certain concentration is diluted to the 0.1% Tween-80 aqueous solution, to be not added with
The corresponding solution of testing sample is negative control.Maize leaf is cut into 2 × 4cm segment, taken after soaking 5s in solution to be measured
Open, bottom is put into after draining and is covered with the culture dish of filter paper (6cm), access 15 first 3 instar larvaes, then it is 22 to place it in temperature
~24 DEG C, relative humidity is 60%, and light application time is 14:Continue to raise in 10h laboratory, record death condition after 24h, often
One experiment is repeated 3 times, and calculates corrected mortality with following equation:
3. the assay method of corn borer
Testing sample is dissolved in dimethyl sulfoxide and certain concentration is diluted to the 0.1% Tween-80 aqueous solution, to be not added with
The corresponding solution of testing sample is negative control.The tender fringe of corn and tender bract are cut into segment, taken after soaking 10s in solution to be measured
Open, be put into after draining in a diameter of 6cm, high 9cm glass culture dish, 15 sizes of access are neat, the health age of corn borer 3 children
Worm, then temperature is placed it in for 22~24 DEG C, relative humidity is 60%, and light application time is 14:Continue to raise in 10h laboratory
Support, death condition is recorded after 24h, each experiment is repeated 3 times, and corrected mortality is calculated with following equation:
4. the assay method of Tetranychus cinnabarinus
Testing sample is dissolved in dimethyl sulfoxide and certain concentration is diluted to the 0.1% Tween-80 aqueous solution, to be not added with
The corresponding solution of testing sample is negative control.Gather the big Kidney bean leaf of insect density, carefully choose make health into mite (30~
50) stay on blade face, taken away after the Kidney bean leaf with worm is immersed into solution 5s to be measured, the training that bottom is covered with filter paper is put into after draining
Support in ware (6cm), be placed on temperature for 22~24 DEG C, relative humidity is 60%, and light application time is 14:10h laboratory relaying
It is continuous to raise, death condition is recorded after 24h, each experiment is repeated 3 times, and corrected mortality is calculated with following equation:
5. the assay method of Culex pipiens pallens
Using the method for world health organisation recommendations, testing sample is dissolved in dimethyl sulfoxide and with 0.1% Tween-80 water
Solution is diluted to certain concentration, to be not added with the corresponding solution of testing sample as negative control.Every kind of solution 1mL is taken, is added respectively
Enter into the 118mL wax dixie cups equipped with 99mL distilled water and 20 instar larvaes of Culex pipiens pallens 3, these dixie cups are placed on temperature
For 22~24 DEG C, relative humidity is 60%, and light application time is 14:Continue to raise in 10h laboratory, dead feelings are recorded after 24h
Condition, each experiment is repeated 3 times, and calculates corrected mortality with following equation:
6. result of the test
The desinsection of the compounds of this invention the results are shown in Table 1.
Table 1
a:The average value of three repetitions.
Understand that the compounds of this invention has preferable cytotoxicity to these insects from upper table 1.
The measure of the antioxygenic property of the compounds of this invention of test example 2
1. instrument and reagent
721B type spectrophotometers, 1,1- diphenyl -2- picryls hydrazine (DPPH), 95% ethanol.
2. determination step
(1) preparation of DPPH and sample solution
0.0130 gram of DPPH is accurately weighed with assay balance, is settled to 95% ethanol in 500mL volumetric flasks, obtains concentration
For 26mg/L solution;0.0100g testing samples accurately are weighed, is settled to 95% ethanol in 100mL volumetric flasks, obtains concentration
For 100mg/L sample solution.
(2) 4mL DPPH solution and 1mL95% ethanol solutions is sequentially added in 10mL conical flasks, stable reaction is mixed
Afterwards, using 95% ethanol as reference solution, its absorbance is determined at λ max=518nm, A is designated as0。
(3) 4mL DPPH solution and 1mL solution to be measured is sequentially added in 10mL conical flasks, shakes up, reacts at room temperature
After 40min is stable, using 95% ethanol as reference solution, its absorbance is determined at wavelength X max=518nm, A is designated asS.Often
One experiment in triplicate, and with following equation calculate antioxidant free radical scavenging activity Y (%):
3. the measurement result of antioxygenic property
Table 2 is when concentration is 100mg/L, clearance rate of the compound to DPPH free radicals
a:The average value of three repetitions.
It was found from upper table 2, the compounds of this invention to the clearance rate of DPPH free radicals all more than 82%, i.e., they have compared with
Good antioxygenic property.